fix: fixed the env handler is updating during upgrade nodejs

[aavinash-nr]

Description:

• This PR Resolves the issue that env handler is getting upgraded during upgrade command

Tests Done:

During Initial Installation (without --esm):

• The Lambda handler is updated to newrelic-lambda-wrapper.handler.
• The handler environment variable is updated.

During Initial Installation (with --esm):

• The Lambda handler is updated to /opt/nodejs/node_modules/newrelic-esm-lambda-wrapper/index.handler.
• The handler environment variable is updated.

During Upgrade (from a non-ESM setup to ESM) :

• The Lambda handler is updated to /opt/nodejs/node_modules/newrelic-esm-lambda-wrapper/index.handler.
• The handler environment variable is not updated.

During Upgrade (from an ESM setup to non-ESM):

• The Lambda handler is updated to newrelic-lambda-wrapper.handler.
• The handler environment variable is not updated.

During Initial Installation for ruby and python function

• The Lambda handler is updated to newrelic_lambda_wrapper.handler.
• The handler environment variable is updated.

During Upgrade for ruby and python function

• The Lambda handler is updated to newrelic_lambda_wrapper.handler.
• The handler environment variable is not updated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.52%. Comparing base (d340bb0) to head (1a21501).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #320      +/-   ##
==========================================
+ Coverage   75.47%   75.52%   +0.04%     
==========================================
  Files          18       18              
  Lines        1574     1577       +3     
==========================================
+ Hits         1188     1191       +3     
  Misses        386      386              

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